What is the best way to have the same content (database + photos) on 2 PCs (PCa & PCb) ?

the result I would achieve is :
PCa : a Picajet Database ( for read and write access) with full size Photos
PCb : same Picajet Database (for read-only access, no database update from here) and half size photos.

I tried to copy of my database from PCa to PCb. The search by categories is working well but when I try to open a photo, the error message still refers to photos of PCa. I however placed my photos in the same folder on both PCs (myDocuments/myPhotos/...) ?